title: Enhanced photocatalytic degradation of humic acids using Al and Fe co-doped TiO2 nanotubes under UV/ozonation for drinking water purification.
abstract: O3/UV/TiO2 was used to effectively decompose humic acids (HAs) in drinking water. To obtain a large specific surface area and low band gap energy, Al and Fe co-doped TiO2 nanotubes were successfully synthesized using the hydrothermal method. The effect of the optimal co-doped TiO2 nanotubes catalyst on the HAs removal efficiency through O3/UV/co-doped TiO2 process was investigated. The highest HAs removal efficiency (79.4%) that exhibited a pseudo-first-order rate constant of 0.172 min(-1) was achieved, in the presence of 550 °C calcined 1.0% co-doped TiO2 nanotubes with an Al:Fe ratio of 0.25:0.75. The effects of calcination temperature and doping concentration on anatase phase weight fractions, average crystallite sizes, Brunauer-Emmett-Teller surface area, catalyst band gap energy, and catalyst photocatalytic activity were also discussed. The inorganic anions also affected the catalyst photocatalytic ability. In a neutral solution, SO4(2-) slightly promoted HAs removal. However, HCO3(-) was found to significantly inhibit the catalyst activity, whereas Cl(-) had negligible effect on photocatalytic ability.
authors.affiliation: Key Laboratory of Educational Ministry for High Efficient Mining and Safety in Metal Mine, University of Science and Technology Beijing, Beijing 100083, China; Department of Environmental Engineering, School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China.
authors.forename: Rongfang
authors.initials: R
authors.lastname: Yuan
authors.forename: Beihai
authors.initials: B
authors.lastname: Zhou
authors.forename: Duo
authors.initials: D
authors.lastname: Hua
authors.forename: Chunhong
authors.initials: C
authors.lastname: Shi
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D002384:Catalysis; D060766:Drinking Water; D006812:Humic Substances; D007501:Iron / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry* / Q000528:radiation effects; D016877:Oxidants / Q000737:chemistry; D010126:Ozone / Q000737:chemistry*; D010782:Photolysis; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays; D014873:Water Pollutants / Q000737:chemistry*; D018508:Water Purification
chemical_list: D060766:Drinking Water; D006812:Humic Substances; D016877:Oxidants; D014873:Water Pollutants; C009495:titanium dioxide; D010126:Ozone; D000535:Aluminum; D014025:Titanium; D007501:Iron
keywords: Al and Fe co-doping; Humic acids; Inorganic anions; Photocatalytic mechanism; TiO(2) nanotubes